Home / 645,516.12-890,743.98-358,990.20

Finding the Fourth Proportional to 645,516.12, 890,743.98 and 358,990.20

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Solution

The fourth proportional to 645,516.12, 890,743.98 and 358,990.20 is: 495,368.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,516.12 : 890,743.98 = 358,990.20 : x
  2. Step 2: Convert to fraction form
    645,516.12/890,743.98 = 358,990.20/x
  3. Step 3: Cross multiply
    645,516.12x = 890,743.98 × 358,990.20
  4. Step 4: Simplify right side
    645,516.12x = 319,768,359,529.00
  5. Step 5: Solve for x
    x = 319,768,359,529.00/645,516.12
  6. Step 6: Final answer
    x = 495,368.51

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.